Windows Firewall Disabled via PowerShell

Severity: medium
Author: Tim Rauch, Elastic (idea)
Source: upstream

Detects attempts to disable the Windows Firewall using PowerShell

MITRE ATT&CK coverage

Tactic	Techniques
Defense Evasion	`T1562` Impair Defenses

Event coverage

Provider	Event ID	Title
Sysmon	1	Process creation

Stages and Predicates

Stage 1: `all of selection_name`

or:
Image|endswith: '\powershell.exe'
Image|endswith: '\powershell_ise.exe'
Image|endswith: '\pwsh.exe'
OriginalFileName: PowerShell.EXE
OriginalFileName: pwsh.dll

Stage 2: `all of selection_args`

CommandLine|contains: ' -Enabled '
CommandLine|contains: ' False'
CommandLine|contains: 'Set-NetFirewallProfile '

Stage 3: `all of selection_opt`

or:
CommandLine|contains: ' -All '
CommandLine|contains: Domain
CommandLine|contains: Private
CommandLine|contains: Public

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

Field	Kind	Values
`CommandLine`	match	`-All` `-Enabled` `False` `Domain` `Private` `Public` `Set-NetFirewallProfile`
`Image`	ends_with	`\powershell.exe` corpus 143 (sigma 143) `\powershell_ise.exe` corpus 27 (sigma 27) `\pwsh.exe` corpus 140 (sigma 140)
`OriginalFileName`	eq	`PowerShell.EXE` corpus 64 (sigma 60, splunk 4) `pwsh.dll` corpus 72 (sigma 68, splunk 4)